Positioning device for securing earth line of a signal transferring unit

Abstract

A signal transferring unit includes a base having a connector for connecting an inlet line and an outlet line. A bolt is threadedly connected to a hole defined in the base and the earth line extends through a transverse passage which is in communication with the hole. A protrusion extends longitudinally from a distal end of the positioning member and a positioning piece is rotatably mounted to the protrusion and has a recess defined in an underside thereof such that the earth line is engaged with the recess.

1 . A signal transferring unit comprising: 
 a base having a connector with two connection ports, a hole defined in the base and a passage transversely defined in the base and communicating with the hole, the passage adapted to receive an earth line therein;    a positioning member inserted in the hole and a protrusion extending longitudinally from a distal end of the positioning member, and    a positioning piece rotatably mounted to the protrusion and having a recess defined in an underside thereof, the recess adapted to compress onto the earth line.    
   
   
       2 . The unit as claimed in  claim 1 , wherein the hole is a threaded hole and the positioning member is a bolt which is threadedly connected to the threaded hole.  
   
   
       3 . The unit as claimed in  claim 1 , wherein two grooves are defined in an inner periphery of the hole and the positioning piece includes two lugs which are movably engaged with the two grooves.  
   
   
       4 . The unit as claimed in  claim 1 , wherein a stop member is connected to the protrusion so that the positioning piece is retained on the protrusion.  
   
   
       5 . The unit as claimed in  claim 4 , wherein the stop member is a washer.  
   
   
       6 . The unit as claimed in  claim 1  further comprising a positioning pin radially extending through a wall enclosing the hole and in contact with the bolt.  
   
   
       7 . The unit as claimed in  claim 1  further comprising a through hole defined through the positioning piece and the protrusion being inserted in the through hole.